Lawyer reflecting on groom's speech (7)
I believe the answer is:
address
'speech' is the definition.
(synonyms)
'lawyer reflecting on groom's' is the wordplay.
'lawyer' becomes 'da' (district attorney).
'reflecting' says the letters should be written in reverse.
'on' means one lot of letters go next to another.
'groom' becomes 'dress' (dressing is a kind of grooming).
'da' back-to-front is 'ad'.
'ad'+'dress'='ADDRESS'
(Other definitions for address that I've seen before include "Speak to at home?" , "Talk - indication of house" , "Speak to, approach" , "In almost desperate straits" , "personal details" .)